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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 8

State What is Meant by the ‘Reactivity Series of Metals’. - Chemistry

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प्रश्न

State what is meant by the ‘reactivity series of metals’

टीपा लिहा
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उत्तर

Activity series of metals:
“Is a series of arrangements of metals in decreasing order of their reactivity.”
i.e. metals at the top are most reactive and least reactive metals are at the bottom of the series. The metal above is more reactive than the lower metal. In other words, K is more reactive than all the metals below it and Na is more reactive than all the metals below it.

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पाठ 6: Chemical Reactions - Exercises

संबंधित प्रश्‍न

Give one example each of which illustrates the following characteristics of a chemical reaction:

evolution of a gas


Fill in the blank

When a piece of copper is added to silver nitrate solution, it turns ............in colour.


How will you obtain Zinc chloride from zinc.

Also give balanced equations for the reactions


What is meant by the metal reactivity series ? State its importance, (any two points).


Classify the following metals based on their reactivity.
Cu, Zn, Ca, Mg, Fe, Na, Li, Hg

More reactive Moderately reactive Less reactive
     
     

Which among the following alloys contain mercury as one of its constituents?


A metal A, which is used in thermite process, when heated with oxygen gives an oxide B, which is amphoteric in nature. Identify A and B. Write down the reactions of oxide B with HCl and NaOH.


Give the steps involved in the extraction of metals of low and medium reactivity from their respective sulphide ores.


Explain the following

  1. Reactivity of Al decreases if it is dipped in HNO3
  2. Carbon cannot reduce the oxides of Na or Mg
  3. NaCl is not a conductor of electricity in solid state whereas it does conduct electricity in aqueous solution as well as in molten state
  4. Iron articles are galvanised.
  5. Metals like Na, K, Ca and Mg are never found in their free state in nature.

Of the three metals X, Y and Z. X reacts with cold water, Y with hot water and Z with steam only. Identify X, Y and Z and also arrange them in order of increasing reactivity.


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